Popularly attributed to A. A. Milne and to Pooh, the quote featured on this Etsy greeting card ("People say nothing is impossible, but I do nothing every day") dates back to well before even the first Pooh book (published 1926). The excellent website Quote Investigator (which, incidentally, make this website look niche, if not redundant) notes that this quote can be traced back to a book called “The Foolish Almanak For Anuthur Year”, published in 1906 by a possible pseudonymous Theodor Rosyfelt, in which it was written: "It is said that nothing is impossible; but there are lots of people doing nothing every day." The same quote has also apparently been misattributed to Alfred E. Neuman of Mad Magazine fame as well as having been adopted by various other people. All up, definitely not a Pooh quote.
Here's the beginning of search page on Etsy for items quoting Piglet as having asked "How do you spell love?" and Pooh replying "You don't spell it, you feel it." There were 43 items on sale in Etsy as of today featuring this popularly-attributed (mis)quote to Pooh and Piglet.
Here's everything that Winnie the Pooh and chums actually said or thought about spelling stuff:
That's it. Less than a dozen things, none of which are about how to spell love.